diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2024-06-03 22:07:23 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2024-06-04 17:37:48 +0300 |
| commit | 91c46b0aa917546432b5b219494859cda0edc39e (patch) | |
| tree | d9b679ed4fb95a43862073742b8bdaafd696a72a /include/linux/ftrace.h | |
| parent | b84214890a9bc56f0fe4ec4fc72f2307ed05096d (diff) | |
| download | linux-91c46b0aa917546432b5b219494859cda0edc39e.tar.xz | |
function_graph: Implement fgraph_reserve_data() and fgraph_retrieve_data()
Added functions that can be called by a fgraph_ops entryfunc and retfunc to
store state between the entry of the function being traced to the exit of
the same function. The fgraph_ops entryfunc() may call
fgraph_reserve_data() to store up to 32 words onto the task's shadow
ret_stack and this then can be retrieved by fgraph_retrieve_data() called
by the corresponding retfunc().
Co-developed with Masami Hiramatsu:
Link: https://lore.kernel.org/linux-trace-kernel/171509109089.162236.11372474169781184034.stgit@devnote2
Link: https://lore.kernel.org/linux-trace-kernel/20240603190823.959703050@goodmis.org
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Florent Revest <revest@chromium.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: bpf <bpf@vger.kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alan Maguire <alan.maguire@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Guo Ren <guoren@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 82cfc8e09cfd..9f61556a9491 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -1053,6 +1053,9 @@ struct fgraph_ops { int idx; }; +void *fgraph_reserve_data(int idx, int size_bytes); +void *fgraph_retrieve_data(int idx, int *size_bytes); + /* * Stack of return addresses for functions * of a thread. |